Telegraphy



(No Model.)

T. A. EDISON.

TELBGRAPHY.

Patented Feb. 25, 1890 UNITED STATES PATE T OFFICE.

THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY.

'TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 422,074, dated February 25, 189 0.

Application filecl FcbruarylQ, 1886. Renewed October 11, 1389. Serial No! 326,653. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS A. EDISON, of Menlo Park, in'the county of Middlesex and State of New Jersey, have invented a new and useful Improvement in Telegraphs, (Case No. 656,) of which the following is a specification.

The object I have in view is to produce a repeater or relay for theinduction telegraphs employing transmitters and receivers of induction impulses, and hereinafter referred to as induction apparatus, which apparatus is described in applications for patents already filed by me Serial Nos. 164,856, 164,857, patented December 29, 1885, and numbered 333,289 and 333,290, and 183,895. This I accomplish by constructing a diaphragm sounder or phonetic receiver (the receivirig-instrument of my induction telegraph) to operate an i11- duction-transmitter circuit. This apparatus may be used to relay or repeat from one circuit to another, or it maybe employed to act directly upon the same circuit, the effect in either case being to introduce additional battery-power and increase the volume of the induction signals.

In the accompanying drawings, forming a part hereof, Figure 1 is a view, principally in diagram, showing the relay or repeaterin connection with two circuits; Fig. 2, a detail view, partly in sectiomof repeater or relay diaphragm and circuit making and breaking devices operated thereby; 3, a view, principally in diagram, showing relay or repeater acting 011 one line; and Fig. 4, a view showing the preferred form. of induction transmitter and receiver.

The induction repeater or relay is composed of a diaphragm A, of any suitable form of phonetic receiver, which diaphragm is itself vibrated by induction signals, and the movement of which is utilized to open and close an induction-transmitter circuit. A construction for accomplishing this is shown in the drawings. The diaphragm A is horizontally arranged. It has a platinum-faced block 13 on its center, from which rises an insulating pin a, carrying a mercury-cup b at its top. A small metal weight C, faced with platinum, rides 011 block B and surrounds pin a, which holds the weight in place. A metal hoop c from weight 0 extends over cup I) and has a pin cl dipping in the mercury for maintaining connection between the weight and a wire 6, also dipping into the mercury. The wire forms one side of an induction-transmitter circuit 1 2,the other side of which runs to the diaphragm A if it be of metal, or to the block 13 if diaphragm is of insulating material. This circuit 1 2 is opened and closed by the hopping of weight 0 on block B, the contacts being the meeting faces of weight and block. Circuit 1 2 includes a battery D, and is connected with line L L, Fig. 1, by a device translating the battery impulses into induction impulses upon the line, such induction impulses forming the short sharp waves of high tension of which the induction signals are composed. This device may be any of those described for this purpose in the applications referred to, but is preferably an electro-magnet E, located directly in line L L and shunted by the circuitl 2. The contacts formed by adjoining faces of block B and weight 0 are preferably shunted by a condenser F. Line L L, Fig. 1, includes the operative element A of the induction repeater or relay. This may be coils similar to those of a 1nagneto-electric telephone-receiver or the chalk cylinder and spring of an electromotographic receiver, as described in the applications referred to. The repeater or relay will repeat or relay induction signals from.

circuit L L to circuit L L. These circuits will have an induction transmitter and receiver, which may be of anyof the forms de scribed in the applications referred to, but are preferably of the form shown in Fi 4, the transmitter being shown at G and the receiver at H. I

The relay or repeater may be used to increase the volume of the induction signals in the same line as shown in Fig. 3. The line L L is provided with a number of induction sets represented by the circles P. Each of these sets may be composed of the devices shown in Fig. 1. I

At one intermediate point on the line or at each of two or more intermediate points will be located a repeater or relay, the operative element A. being directly in the line, and

also the magnet E, shunted byinductiomtransstood from the applications referred to, ,may be used alone for telegraphing by .m,eans of Morse signals or in connection With ordinary Morse telegraph apparatus, consisting of signaling keys and relays, the circuit at the signaling-keys being kept constantly closed for the induction signals by condenser or resistance shunts.

What I claim is 1. In telegraphs, the combination, with a signaling-key and an induction device for transmitting induction telegraphic impulses, of a diaphragm relay or repeater receiving such induction impulses, a'circuit controlled by such diaphragm relay or repeater, an ind uction device in such relaying or repeating'circuit for transmitting induction telegraphic impulses, and a diaphragm receiver for receiving the latter induction impulses, substantially asset forth. j

2. In induction telegraphs, the combination, with a telegraphic transmitter and a diaphragm receiver, of a circuit-controller operated by the movement of the diaphragm and acircuit opened and closed by said circuitcontroller, a battery in said circuit, and an induction device for translatingthe battery- Waves into telegraphic induction impulses, and a condenser shunting said circuit-controller, substantially as set forth.

3. An induction-telegraph repeater or relay having, in combination, an electro-magnet with coils in one circuit, a horizontal diaphragm vibrated by such electro-magnet, a hopping weight carried by such diaphragm, and a repeating or relaying circuit controlled by the movement of such Weight, substantially as set 'forth.

4. An induction-telegraph repeater or relay having, in combination, a diaphragm, an operating element therefor, a circuit-controlling Weight carried by the diaphragm, and a mercury-cup with points maintaining-(siren it with such Weight, substantiallyas set forth.

Thisspecification:signed and witnessed this 24th ,day of November, 1885.

THOS. A. Y EDISON. Witnesses:

A. W. KIDDLE, O. ROWLAND. 

